The diagram illustrates the steps involved in biofuel production.
Overall, it is obvious that this circular and complicated process consists of ten stages, beginning when energy causes plants to grow and ending when cars and planes emit carbon dioxide into the atmosphere.
Initially, energy, as a mix of sunlight and carbon dioxide, influences plants and trees to make them grow. Once trees and plants grow up enough, they are harvested by combines and then go through pre-processing procedures to be crushed into small pieces. Thereafter, this substance forms cellulose, which is churned with some chemicals during the processing stage to let molecules of sugars appear. Subsequently, microbes are added and diffused into this substance, then as a result, ethanol appears.
Finally, ethanol works as a biofuel for cars, trucks and planes, which then emit carbon dioxide back into the atmosphere, letting the process start again.